Berlin 2014 – wissenschaftliches Programm

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EP: Fachverband Extraterrestrische Physik

EP 8: Sonne und Heliosphäre (II)

EP 8.1: Hauptvortrag

Freitag, 21. März 2014, 10:30–11:00, DO24 1.103

Solar magnetic fields and their heliospheric response — •Julia K. Thalmann — Institute of Physics/IGAM, University of Graz, 8010 Graz, Austria

Permanently (re-)generated by a dynamo action deep inside the Sun, a large-scale magnetic field is extending far out into interplanetary space and in the form of the solar wind causing the so-called space weather. Global as well as local features of the Sun's magnetic field reappear more or less regularly with alternating periods of low and high activity. The temporal evolution of the global magnetic field and superposed, smaller-scale centers of activity (active regions) determine the dynamics in the inner heliosphere. Most impressive, localized solar phenomena like flares and coronal mass ejection originate from the magnetically closed solar active regions and expel considerable amounts of charged particles and radiation. In addition large-scale, magnetically open regions like coronal holes that interact with neighboring magnetically closed regions contribute to the ongoing acceleration of solar wind particles and cause a corresponding heliospheric response. A concise summary of our current understanding of the physical contributors dominating the dynamics in the inner heliosphere is necessary and important in order to possibly realize real-time space weather prediction and formulate remaining open questions for future missions.